Improvement in ventilators



UNITED STATES PATENT OEEIoE.

W. O. CRAWFORD, OF NORTH STAR, PENNSYLVANIA.

IM PROVEMENT IN VENTILATO RS.

Specification forming part of Letters Patent No. 77,003. dated April 21, 1868.

To all whom it may concern:

Be it known that I, W. O. CRAWFORD, of North Star, in the county of Allegheny and State of Pennsylvania, have invented a new and Improved Ventilator; and I do hereby declare that the following is a full, clear, and exact description thereof?, which will enable those skilled in the art to make and use the same, reference being had to the accompanying drawings, forming part of this specication.

This invention relates to a newand improved method of ventilating rooms, and supplying fresh air in all situations where it may be desirable or necessary; and it consists in confining within a case or cabinet of suitable size one or more air-bellows, which maybe operated by clock-work propelled by a spring or by a weight, the said clock-work or gearing being placed within the box, as will herein- 'after be more fully described.

The drawing represents an elevation of the ventilator with the doors thrown. back, showing the arrangement of the bellows and the clock-work iu the interior, and the manner in which the bellows are connected with the clock-work.

Similar letters ot' reference indicate corresponding parts.

A represents the case or cabinet, which is something in the form of a low bureau or sideboard, of a size suited for easy transportation from one room or one building to another. this example of my invention the vfront of the ventilator is closed, when desired, by double or folding doors, (marked B.)

O O represent the bellows, on the right and left hand sides of the ventilator, attached to a tubular frame, which surrounds them, and which forms the channel or passage-way for the air. This air-tube is marked D, andthe base of each bellows is connected with it at the points marked a a.. Fresh air from without is admitted by this tube D to the bellows through the aperture E at the bottom of the ventilator.

There are suitable valves in the bellows A which open and close in the usual manner, so that the air which is admitted into the bellows through E is forced out through the tubes F from the top of the ventilator. These tubes F may be connected with the sides of the ventilator instead of the top, if desired.

It will be seen that the bellows have a lateral motion imparted to them by the clockwork. For this purpose the gearing or clockwork is placed in the back par-trof the ventilator, and it has a projecting shaft, which has upon its end a crank-wheel, c. this crank-wheel there is a wrist-pin, (seen at d in the drawing.)

ff represent pitman-rods, which are attached to the crank-wheel c by the wrist-pin d at one end. The other ends are attached to the heads of the bellows, as-seen in the drawmg.

The clock-work or gearing` is arranged to give the required motion to the bellows, and the speed .is regulated by a iiier, g, which is given a great velocity for that purpose.

I do not confine myself to any particular 'system of gearing for the purpose intended, nor to the coil-spring as a motive power, as I am aware that the gearing' may be varied, and a weight may be used for the same purpose; but,

Having thus described my invention, I claim as new and desire to secure by Let-ters Pat- The arrangement within the portable case A of the bellows O O, being opposite to each other within said case, and surrounded by the pipes D F, said bellows being operated from the central clock-work by means of the pitmenff, as herein described, for the purpose specitied.

W. O. CRAWFORD.

Witnesses THoMAs DONALDSON, R. S. CooK.

On the face of 

